igneous
Pink Granite
Phaneritic Felsic Igneous Rock
Hardness: 6-7 Mohs; Color: Pink, reddish-orange, white, and black mottled; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Cleavage: Perfect in feldspar grains; SG: 2.63-2.75
- Hardness
- 6-7 Mohs
- Color
- Pink, reddish-orange, white, and black mottled
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6-7 Mohs; Color: Pink, reddish-orange, white, and black mottled; Luster: Vitreous to dull; Crystal structure: Phaneritic (coarse-grained); Cleavage: Perfect in feldspar grains; SG: 2.63-2.75
Formation & geological history
Formed from the slow cooling of silica-rich magma deep within the Earth's crust (plutonic). This process allows large crystals of quartz, K-feldspar, and mica to grow. Common in continental shields and mountain roots.
Uses & applications
Extensively used in construction for countertops, floor tiles, paving stones, curbing, and commemorative monuments/gravestones due to its durability and aesthetics.
Geological facts
Granite makes up a large portion of the Earth's continental crust. The pink color specifically comes from an abundance of potassium feldspar (orthoclase). It is one of the hardest and most durable natural stones used by humans since ancient Egypt.
Field identification & locations
Identified in the field by its 'salt and pepper' or mottled appearance with interlocking visible crystals. Look for the pinkish hue of feldspar and the glassy, translucent look of quartz. Found in massive outcrops or as glacial erratics.
